Initial import

1 files changed, 366 insertions, 0 deletions

diff --git a/lzo/src/lzo1x_oo.ch b/lzo/src/lzo1x_oo.ch
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+++ b/lzo/src/lzo1x_oo.ch
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+/* lzo1x_oo.ch -- LZO1X compressed data optimizer
+
+   This file is part of the LZO real-time data compression library.
+
+   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
+   All Rights Reserved.
+
+   The LZO library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of
+   the License, or (at your option) any later version.
+
+   The LZO library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the LZO library; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+   Markus F.X.J. Oberhumer
+   <markus@oberhumer.com>
+   http://www.oberhumer.com/opensource/lzo/
+ */
+
+
+#define TEST_IP     (ip < ip_end)
+#define TEST_OP     (op <= op_end)
+
+#define NO_LIT      LZO_UINT_MAX
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+static void copy2(lzo_bytep ip, const lzo_bytep m_pos, lzo_uint off)
+{
+    assert(off > 0);
+    ip[0] = m_pos[0];
+    if (off == 1)
+        ip[1] = m_pos[0];
+    else
+        ip[1] = m_pos[1];
+}
+
+
+static void copy3(lzo_bytep ip, const lzo_bytep m_pos, lzo_uint off)
+{
+    assert(off > 0);
+    ip[0] = m_pos[0];
+    if (off == 1)
+    {
+        ip[2] = ip[1] = m_pos[0];
+    }
+    else if (off == 2)
+    {
+        ip[1] = m_pos[1];
+        ip[2] = m_pos[0];
+    }
+    else
+    {
+        ip[1] = m_pos[1];
+        ip[2] = m_pos[2];
+    }
+}
+
+
+/***********************************************************************
+// optimize a block of data.
+************************************************************************/
+
+LZO_PUBLIC(int)
+DO_OPTIMIZE          (       lzo_bytep in , lzo_uint  in_len,
+                             lzo_bytep out, lzo_uintp out_len,
+                             lzo_voidp wrkmem )
+{
+    lzo_bytep op;
+    lzo_bytep ip;
+    lzo_uint t;
+    lzo_bytep m_pos;
+    lzo_bytep const ip_end = in + in_len;
+    lzo_bytep const op_end = out + *out_len;
+    lzo_bytep litp = NULL;
+    lzo_uint lit = 0;
+    lzo_uint next_lit = NO_LIT;
+    lzo_uint nl;
+    unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
+
+    LZO_UNUSED(wrkmem);
+
+    *out_len = 0;
+
+    op = out;
+    ip = in;
+
+    assert(in_len >= 3);
+    if (*ip > 17)
+    {
+        t = *ip++ - 17;
+        if (t < 4)
+            goto match_next;
+        goto first_literal_run;
+    }
+    assert(*ip < 16 || (*ip == 17 && in_len == 3));
+
+    while (TEST_IP && TEST_OP)
+    {
+        t = *ip++;
+        if (t >= 16)
+            goto match;
+        /* a literal run */
+        litp = ip - 1;
+        if (t == 0)
+        {
+            t = 15;
+            while (*ip == 0)
+                t += 255, ip++;
+            t += *ip++;
+        }
+        lit = t + 3;
+        /* copy literals */
+copy_literal_run:
+        *op++ = *ip++; *op++ = *ip++; *op++ = *ip++;
+first_literal_run:
+        do *op++ = *ip++; while (--t > 0);
+
+
+        t = *ip++;
+
+        if (t >= 16)
+            goto match;
+#if defined(LZO1X)
+        m_pos = op - 1 - 0x800;
+#elif defined(LZO1Y)
+        m_pos = op - 1 - 0x400;
+#endif
+        m_pos -= t >> 2;
+        m_pos -= *ip++ << 2;
+        *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
+        lit = 0;
+        goto match_done;
+
+
+        /* handle matches */
+        do {
+            if (t < 16)                     /* a M1 match */
+            {
+                m_pos = op - 1;
+                m_pos -= t >> 2;
+                m_pos -= *ip++ << 2;
+
+                if (litp == NULL)
+                    goto copy_m1;
+
+                /* assert that there was a match just before */
+                assert(lit >= 1 && lit <= 3);
+                assert(litp == ip - 2 - lit - 2);
+                assert((lzo_uint)(*litp & 3) == lit);
+                nl = ip[-2] & 3;
+                /* test if a match follows */
+                if (nl == 0 && lit == 1 && ip[0] >= 16)
+                {
+                    next_lit = nl;
+                    /* adjust length of previous short run */
+                    lit += 2;
+                    *litp = LZO_BYTE((*litp & ~3) | lit);
+                    /* copy over the 2 literals that replace the match */
+                    copy2(ip-2,m_pos,pd(op,m_pos));
+                    o_m1_a++;
+                }
+                /* test if a literal run follows */
+                else if (nl == 0 && ip[0] < 16 && ip[0] != 0 &&
+                         (lit + 2 + ip[0] < 16))
+                {
+                    t = *ip++;
+                    /* remove short run */
+                    *litp &= ~3;
+                    /* copy over the 2 literals that replace the match */
+                    copy2(ip-3+1,m_pos,pd(op,m_pos));
+                    /* move literals 1 byte ahead */
+                    litp += 2;
+                    if (lit > 0)
+                        lzo_memmove(litp+1,litp,lit);
+                    /* insert new length of long literal run */
+                    lit += 2 + t + 3; assert(lit <= 18);
+                    *litp = LZO_BYTE(lit - 3);
+
+                    o_m1_b++;
+                    *op++ = *m_pos++; *op++ = *m_pos++;
+                    goto copy_literal_run;
+                }
+copy_m1:
+                *op++ = *m_pos++; *op++ = *m_pos++;
+            }
+            else
+            {
+match:
+                if (t >= 64)                /* a M2 match */
+                {
+                    m_pos = op - 1;
+#if defined(LZO1X)
+                    m_pos -= (t >> 2) & 7;
+                    m_pos -= *ip++ << 3;
+                    t = (t >> 5) - 1;
+#elif defined(LZO1Y)
+                    m_pos -= (t >> 2) & 3;
+                    m_pos -= *ip++ << 2;
+                    t = (t >> 4) - 3;
+#endif
+                    if (litp == NULL)
+                        goto copy_m;
+
+                    nl = ip[-2] & 3;
+                    /* test if in beetween two long literal runs */
+                    if (t == 1 && lit > 3 && nl == 0 &&
+                        ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16))
+                    {
+                        assert(*litp == lit - 3);
+                        t = *ip++;
+                        /* copy over the 3 literals that replace the match */
+                        copy3(ip-1-2,m_pos,pd(op,m_pos));
+                        /* set new length of previous literal run */
+                        lit += 3 + t + 3; assert(lit <= 18);
+                        *litp = LZO_BYTE(lit - 3);
+                        o_m2++;
+                        *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
+                        goto copy_literal_run;
+                    }
+                }
+                else
+                {
+                    if (t >= 32)            /* a M3 match */
+                    {
+                        t &= 31;
+                        if (t == 0)
+                        {
+                            t = 31;
+                            while (*ip == 0)
+                                t += 255, ip++;
+                            t += *ip++;
+                        }
+                        m_pos = op - 1;
+                        m_pos -= *ip++ >> 2;
+                        m_pos -= *ip++ << 6;
+                    }
+                    else                    /* a M4 match */
+                    {
+                        m_pos = op;
+                        m_pos -= (t & 8) << 11;
+                        t &= 7;
+                        if (t == 0)
+                        {
+                            t = 7;
+                            while (*ip == 0)
+                                t += 255, ip++;
+                            t += *ip++;
+                        }
+                        m_pos -= *ip++ >> 2;
+                        m_pos -= *ip++ << 6;
+                        if (m_pos == op)
+                            goto eof_found;
+                        m_pos -= 0x4000;
+                    }
+                    if (litp == NULL)
+                        goto copy_m;
+
+                    nl = ip[-2] & 3;
+                    /* test if in beetween two matches */
+                    if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16)
+                    {
+                        assert(litp == ip - 3 - lit - 2);
+                        assert((lzo_uint)(*litp & 3) == lit);
+                        next_lit = nl;
+                        /* make a previous short run */
+                        lit += 3;
+                        *litp = LZO_BYTE((*litp & ~3) | lit);
+                        /* copy over the 3 literals that replace the match */
+                        copy3(ip-3,m_pos,pd(op,m_pos));
+                        o_m3_a++;
+                    }
+                    /* test if a literal run follows */
+                    else if (t == 1 && lit <= 3 && nl == 0 &&
+                             ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16))
+                    {
+                        assert(litp == ip - 3 - lit - 2);
+                        assert((lzo_uint)(*litp & 3) == lit);
+                        t = *ip++;
+                        /* remove short run */
+                        *litp &= ~3;
+                        /* copy over the 3 literals that replace the match */
+                        copy3(ip-4+1,m_pos,pd(op,m_pos));
+                        /* move literals 1 byte ahead */
+                        litp += 2;
+                        if (lit > 0)
+                            lzo_memmove(litp+1,litp,lit);
+                        /* insert new length of long literal run */
+                        lit += 3 + t + 3; assert(lit <= 18);
+                        *litp = LZO_BYTE(lit - 3);
+
+                        o_m3_b++;
+                        *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos++;
+                        goto copy_literal_run;
+                    }
+                }
+copy_m:
+                *op++ = *m_pos++; *op++ = *m_pos++;
+                do *op++ = *m_pos++; while (--t > 0);
+            }
+
+match_done:
+            if (next_lit == NO_LIT)
+            {
+                t = ip[-2] & 3;
+                lit = t;
+                litp = ip - 2;
+            }
+            else
+                t = next_lit;
+            assert(t <= 3);
+            next_lit = NO_LIT;
+            if (t == 0)
+                break;
+            /* copy literals */
+match_next:
+            do *op++ = *ip++; while (--t > 0);
+            t = *ip++;
+        } while (TEST_IP && TEST_OP);
+    }
+
+    /* no EOF code was found */
+    *out_len = pd(op, out);
+    return LZO_E_EOF_NOT_FOUND;
+
+eof_found:
+    assert(t == 1);
+#if 0
+    printf("optimize: %5lu %5lu   %5lu   %5lu %5lu\n",
+           o_m1_a, o_m1_b, o_m2, o_m3_a, o_m3_b);
+#endif
+    LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
+    LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
+    *out_len = pd(op, out);
+    return (ip == ip_end ? LZO_E_OK :
+           (ip < ip_end  ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
+}
+
+
+/*
+vi:ts=4:et
+*/
+